Fw: [heathkit-yahoo] Heath HW-100 Plate Modulation Mod

[Wilson Lamb]

Yea, I can relate to a lack of time.
You want to run in hard class C for the plate modulated final, just like in 
CW.
As someone said, the plate voltage may be a little high for AM, so maybe get 
another HP-23 and run it from a variac.  I expect the tube ratings are still 
in the handbook, although I haven't looked in ages.  Someone will have them 
if you don't.  I'd just look at the bypass cap.  There's no reason for the 
choke to be a problem.  Yes, the plate tuning cap could be a problem, but 
you can't tell without trying it.  Run the rig in CW, with the modulator in 
series with the B+ from the second supply.  When you get the level set with 
a scope, you'll be on the air.

Tell us about the modulator.  Stand alone mods are pretty rare!

Where do you live?
Wilson
----- Original Message ----- 
From: "kd4e" <doc at kd4e.com>
To: "Wilson Lamb" <infomet at mindspring.com>
Cc: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, August 22, 2007 3:18 PM
Subject: Re: Fw: [heathkit-yahoo] Heath HW-100 Plate Modulation Mod


>I cannot contemplate a project of that magnitude right now.
>
> I own the HW-100 and the outboard modulator.
>
> I'd like my mods to the HW-100 to be reversable (other than
> merely beefed-up components) so will look at relays to select
> between AB and C Class and other mode-relevant changes.
>
> 100W of high-level plate modulation is an important project
> parameter - I remain unpersuaded that 25 or even 100W of
> less-than-high-level AM will cut it on noisy bands and across
> long distances except when propagation is excellent and my
> antennas are optimized.
>
>>> If you really want an education, build a nice final and modulator,  The 
>>> HW would make an excellent exciter for a 4-400, 4-250, or even a pair of 
>>> 811s. If you keep the power down to about 500W, a pair of 811s would do 
>>> the modulation.  It would be a lot of work and an education, but fun 
>>> too. Most of the components are available and cheap, if you know how to 
>>> scrounge, except for the mod trans.  Once people know you are serious, 
>>> things start to come out of basements and attics, since there is 
>>> virtually no real demand for the stuff anymore.  Hamfests are great 
>>> sources too.
>>>
>>> If you use plug in coils, or confine yourself to one band, the RFpart 
>>> is very simple.
>>> Wilson
>>> W4BOH
>
>
> -- 
>
> Thanks! & 73, doc, KD4E
> Personal: http://bibleseven.com/kd4e.html
> 

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